Centrifugal pump.



- Patented. 1,1, 1910.

, ttys f .ma

A.l EK GUY.V

GENTRIFUGAL PUMP;

-grrLxoA'rloN IILED Armin, 190s. K

To all {whom-it may concern:

ponrrnn srnrns .PATENT torsion. i,

ALBERT E. GUY, 0F-TRENTGN, NEW JERSEY, ASSIGNOR TO DE LVAL STEAM TURBINE COMPANY, OF NEW IYRK, N. A CORPORATIONiOF NEW IE`.RS.`E}Y.y

1 CENTRIFUGAL PUMP,

v Specification of Letters Pate-ntl Application tiled April 10, 1909. Serial No. 489.187.

Be it'known that I, ALBERT E. GUY, a citizen of the United States of America., and a resident of Trenton, county of Merccr, State of New Jersey, have invented certain ne7 and useful improvements in Centrifugal Pumps, of which the following is a specification. l

My invention Vrelates to improvements in` centrifugal vpumps and particularly to improvements in 'the Wearing rings of such pumps; and my invention comprises wearingr rings on the external wall of the inlet portion of the impeller and complementary Wearing rings in the corresponding portion of the pump casing, said rings having intermeshin" flanges enacting to reduce leakage.

lily invention also comprises a novel con*y struct-ion of stationary wearing rings, whereby the same serve as nozzles to conduct', the liquid to the impeller, with al minimum of fiuid resistance, fluid friction, etc.

- 'Other features of my invention are. here-y inafter described and pointed outin the appended claims.

The object of my invention is to improve centrifugal amps, and particularly to increase the e cient-y of such pumps.

I will now roeeed -to describe my invention with re ereucc to the accompanying drawing, in which `l have shown a fragmentary axial section of a centrifugal pump embodying my invention.

In the said drawing, l designates the .pump casing, 2 the shaft of the pump, and il, 3 impellers mounted on said shaft. The number ot these impellers is immaterial to the present invention, and the pump may he constructed in one or in as man v stages as may he desired; the particular kpump illus trated hcing a two-stage pump. The pump Vmay he understood rto have the usual admission duct. of which 4 in the drawing, indi- Cates the inner portion.

5 designates the usual -c'liseharflfc duct..

The impellers 3 are ot sul'istantially the usual construction. The. pump casing com' prises passages 6 into which the two imprellvers discharge. the iirst of these passages ,'LiirziL 6 leadingV toa return bend passage 'r' in turn leads to the inlet of the szw-ond impeller; while the second passage loads to the 'discharge duct 3. The }'ia-iti i1lar strueture shown embodies features set: forth in my application Sr. No. 444,345, tilcdJulyQO,

Patented Oct. 11, 1910.'

; 1908. in thatI the chambers into which the im pellers discharge, are ot' materially greater cross sectional area than'the. discharge area of their impellers, respectively, sucl1'pas- I sages increasing progressively in area fromk the impeller outward, and being unobstructed; the purpose of this construction being thatthe kinetic energy of the liquid dis- L charged from the impeller shallbe converted into potential energy with as little churning ot the liquid as possihl'e,the velocity of the liquid being low by the time such, liqtid'-has reached the point.- where thepassige 'changes direction; In the return passage 7 I pro vide the usual stationary vanos t5.

Namur-als Si' designate stationary wearing rings seated iuA suitable grooves 1Q in the 1icasiug and located just in advaice of the im i! peller entrances; and numerals 11 designate similar stationary wearing rings located at the hacks of the impellcrs and ylilvvise seated in `grooves iu the pump casing.

Numerals 12 designate rotary wearing rings mounted upon the external walls of the inletI` portions of the impellers, on the entrance'sides thereof, and numerals 13 desigf nate similar. rotary wearing rings mounted on the rear sides of the impellers. 'Eheringe 9 and h have intermeshing' {ianges H and 15 respectively. forming tortuous' passages which restrict and reduce to a minimum leakage of liquid. The stationary Wearing rings 9 have substantially the same internal diameter as that of the entrances of the impellors. and are. located just. in advance of these impellers, and hence serve as nozzles to lead the. liquid to theimpellers. These wearing rings 9 also have rounded edges 16 serving: to reduce friction of the water moving' to the impeliers. to a minimum.

l am aware. that heretofore fearing ringsv have heen provided upon the external walls of the inlet portions of impellers, .such rings courting with other rings surroiuuliog such impelicr rings aud the .said inlet portions' of the impellers. Huch construction has important disadvantages as compared with the structure herein illustrated and described,

further objection tothe prior construction mil rad

referred to, as compared with the construc- `tion herein illustrated and described, is that 1n such prior construction the wearing rings must fit very closely in order to prevent extween the two wearing rings the clearance and for this reason the inipel .should be very short.; and the arrangement between the rings may be, greater without Yleakage exceeding the pcrniis minin'niin, ier has greater freedom and there is less wear between the rings. l am also aware that it has` beenprd iinpcller. and another renioi'ablc and renew posed heretofore to provide wearing rin 1n the sides of the chamber in which the. im'

peller rotates, and to provide corresponding` wearing rings on the. adjacent rotating faces 'of the iuipeller; the disadvantages ot such i prior construction, as coiniki'aredwith thef construction herein illustrate being that. the wearing ring. corresponding dimensions o pumps, and

and de hence require more metal, and wearing surraces are ot greater area kand the relative :ribed, re larger, 'for 5 velocity between the wearing rings isi greater, thesecoiiditions all causing greater friction and greaterexpense. Furthermore, g

such prior construe-.tions as referred to, pre clade. the use of the stat ionary wearing rin:` as means for leading the liquid to the iii' pellers, and hence for this reason the liquid ing ring carri-id on .said inlet portion, said nearing rings provided with niternieshnig is not'J led as easily to the inipellers and itl little friction, churning, etc., in theg structure herein,illustrated sind descriliied. l

imich Yanes are designated by nniiierals l? portion of the iinpcller through wliieli'rhe water passes hctore reaching such vant of wearing rings herein illustrated and described permits the introductory portion of the. impeller to be ver)l short. Y

A further advantage ot' the structure illustrated and described herein, as compared in the accompanying drawing` hence the :ith that. in which wearing rings are provided 'in the sides of rho chamber, eoactizig 2 with the side of theiinpeller or with wearing rings provided on tne side of the iinpeller, is, that; the iinpeller rings beings?E smaller, for corresponding dimensions o?! 1 to the impeller.

pump` in the structure herein illustrated and described, the spaces for leakage are smaller and hence the leakage is less.

The inipeller rings 10 and 13 are of similar form and dimensions to the rings S) and nih-t portion ot the nnpellcr, said casing gecmipz-isiu;l :in admission space in advance Sr. No. 501,301, I have claimed certain iezicomprisiug in l. .t ccnirliugal pump combination a casing. a rotary inipcller ihm-tizi having :in inlet portion extending axially from iie main portion of the im- ;wller. a ii"iii-'.:iile :ind renewable labyriniliiiie wearing ring mounted upon the externa! `wall o-'I the said inlet portion of the able lzdrrriuiainr wearing ring carried Aby the casing and located in proxnini to the d et the said inlet portion of the impcllei said inlet portion. .trflugailpump comprising 1n ilaiiaion a 'asa 'r coi i tiring@ toi-nii a tortuous passage between the rings lori-duce leakage., v

.k centrifugal pump comprising in combination :i casing.A .a rotary iinpeller therein, hating an inlet; portion extending axially from the main portion of the, inipellcr, a wearing ring mounted upon the external. wall ot' said inletportion of the. inipellcr, and another wcziriirr1r ring,r carried by the casing and located in proximity to the cad of said extended inlet portion of the impr-ller, and in proximity to the side of the i waiting ring on such extended inlet portion,

.-.iid casing comprising, in advance of the wearing ring. an adnt-ission space, the bore of .said wearingr ringl of the casing of less diameter than said admission space and forming substantially a continuation of the entrance of the impellcr, said wearing 'rin therefore serving as a nozzle to lead liqui l. it .centrifugal pump comprising in combination a casing, a rotary impellcr therein` and an anti-leakage ring carried by the casing' and located in proximity-cto the ir, zirotary nupellerY friert-in 'having' an inlet portion extending' proxnnityio the side of the wearing therein, having an inlet portion extending! axinlv from the main portion of `the iin- 5 pellcrg an :ux anti-leakage rino' carried by theeusing and located in proxlmiqY tothe end of said inlet portion of the nnpeller', said casing' comprising an admission space in advance of said ring, the bore of said 10 'ring of less diameter than said admission space :md forming substantiall a continuation of the entrance yof the impellerg and serving as :i nozzle to direct liquid therein,

n said bore being of tapering form to lead the. 15 liquid gralna'ily to the impeller.

6. A centrifugal pump comprising in coxnhiimfiony :1 casing, a, rotnry' impeller therein having on lts rearside an axially extending flange, :i remorzihle peripheral wall of said liungerand unoiher removahleanrl renewable lnbyrinthinc weer ing ring carried by the casing ansi located in proximity :o thevside of Said impeller wearing ring unrl (reacting tlxerewith.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.v

AALBERT E. .fUY Witnesses: y Y

. H. M. MARHLE,

F RANK E. RAFFMAN.

:md renewable Alabyrmilnne wearing ring mounted upon ythe 

